content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------
   * AxisCollection.java
   * -------------------
   * (C) Copyright 2003-2012, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 03-Nov-2003 : Added standard header (DG);
   * 17-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.axis;
  
  import java.util.List;
  
  import org.jfree.chart.ui.RectangleEdge;
  
  /**
   * A collection of axes that have been assigned to the TOP, BOTTOM, LEFT or
   * RIGHT of a chart.  This class is used internally by JFreeChart, you won't
   * normally need to use it yourself.
   */
  public class AxisCollection {
  
      /** The axes that need to be drawn at the top of the plot area. */
      private List<Axis> axesAtTop;
  
      /** The axes that need to be drawn at the bottom of the plot area. */
      private List<Axis> axesAtBottom;
  
      /** The axes that need to be drawn at the left of the plot area. */
      private List<Axis> axesAtLeft;
  
      /** The axes that need to be drawn at the right of the plot area. */
      private List<Axis> axesAtRight;
  
      /**
       * Creates a new empty collection.
       */
      public AxisCollection() {
          this.axesAtTop = new java.util.ArrayList<Axis>();
          this.axesAtBottom = new java.util.ArrayList<Axis>();
          this.axesAtLeft = new java.util.ArrayList<Axis>();
          this.axesAtRight = new java.util.ArrayList<Axis>();
      }
  
      /**
       * Returns a list of the axes (if any) that need to be drawn at the top of
       * the plot area.
       *
       * @return A list of axes.
       */
      public List<Axis> getAxesAtTop() {
          return this.axesAtTop;
      }
  
     /**
      * Returns a list of the axes (if any) that need to be drawn at the bottom
      * of the plot area.
      *
      * @return A list of axes.
      */
     public List<Axis> getAxesAtBottom() {
          return this.axesAtBottom;
      }
  
      /**
       * Returns a list of the axes (if any) that need to be drawn at the left
       * of the plot area.
       *
       * @return A list of axes.
       */
      public List<Axis> getAxesAtLeft() {
          return this.axesAtLeft;
      }
  
      /**
      * Returns a list of the axes (if any) that need to be drawn at the right
      * of the plot area.
      *
      * @return A list of axes.
      */
      public List<Axis> getAxesAtRight() {
          return this.axesAtRight;
      }
  
      /**
       * Adds an axis to the collection.
       *
       * @param axis  the axis (<code>null</code> not permitted).
       * @param edge  the edge of the plot that the axis should be drawn on
       *              (<code>null</code> not permitted).
       */
      public void add(Axis axis, RectangleEdge edge) {
          if (axis == null) {
              throw new IllegalArgumentException("Null 'axis' argument.");
          }
          if (edge == null) {
              throw new IllegalArgumentException("Null 'edge' argument.");
          }
          if (edge == RectangleEdge.TOP) {
              this.axesAtTop.add(axis);
          }
          else if (edge == RectangleEdge.BOTTOM) {
              this.axesAtBottom.add(axis);
          }
          else if (edge == RectangleEdge.LEFT) {
              this.axesAtLeft.add(axis);
          }
          else if (edge == RectangleEdge.RIGHT) {
              this.axesAtRight.add(axis);
          }
      }
  
  }
  